diff --git a/ospfd/ospf_lsa.h b/ospfd/ospf_lsa.h
index 251d473..e51f7e8 100644
--- a/ospfd/ospf_lsa.h
+++ b/ospfd/ospf_lsa.h
@@ -49,6 +49,7 @@
 
 #define OSPF_LSA_HEADER_SIZE	     20U
 #define OSPF_ROUTER_LSA_LINK_SIZE    12U
+#define OSPF_ROUTER_LSA_TOS_SIZE      4U
 #define OSPF_MAX_LSA_SIZE	   1500U
 
 /* AS-external-LSA refresh method. */
diff --git a/ospfd/ospf_spf.c b/ospfd/ospf_spf.c
index ca20022..6dcf0b1 100644
--- a/ospfd/ospf_spf.c
+++ b/ospfd/ospf_spf.c
@@ -356,9 +356,6 @@
   return -1;
 }
 
-#define ROUTER_LSA_MIN_SIZE 12
-#define ROUTER_LSA_TOS_SIZE 4
-
 /* Find the next link after prev_link from v to w.  If prev_link is
  * NULL, return the first link from v to w.  Ignore stub and virtual links;
  * these link types will never be returned.
@@ -380,8 +377,8 @@
   else
     {
       p = (u_char *) prev_link;
-      p += (ROUTER_LSA_MIN_SIZE +
-            (prev_link->m[0].tos_count * ROUTER_LSA_TOS_SIZE));
+      p += (OSPF_ROUTER_LSA_LINK_SIZE +
+            (prev_link->m[0].tos_count * OSPF_ROUTER_LSA_TOS_SIZE));
     }
 
   lim = ((u_char *) v->lsa) + ntohs (v->lsa->length);
@@ -390,7 +387,7 @@
     {
       l = (struct router_lsa_link *) p;
 
-      p += (ROUTER_LSA_MIN_SIZE + (l->m[0].tos_count * ROUTER_LSA_TOS_SIZE));
+      p += (OSPF_ROUTER_LSA_LINK_SIZE + (l->m[0].tos_count * OSPF_ROUTER_LSA_TOS_SIZE));
 
       if (l->m[0].type != lsa_type)
         continue;
@@ -755,8 +752,8 @@
         {
           l = (struct router_lsa_link *) p;
 
-          p += (ROUTER_LSA_MIN_SIZE +
-                (l->m[0].tos_count * ROUTER_LSA_TOS_SIZE));
+          p += (OSPF_ROUTER_LSA_LINK_SIZE +
+                (l->m[0].tos_count * OSPF_ROUTER_LSA_TOS_SIZE));
 
           /* (a) If this is a link to a stub network, examine the next
              link in V's LSA.  Links to stub networks will be
@@ -989,8 +986,8 @@
         {
           l = (struct router_lsa_link *) p;
 
-          p += (ROUTER_LSA_MIN_SIZE +
-                (l->m[0].tos_count * ROUTER_LSA_TOS_SIZE));
+          p += (OSPF_ROUTER_LSA_LINK_SIZE +
+                (l->m[0].tos_count * OSPF_ROUTER_LSA_TOS_SIZE));
 
           if (l->m[0].type == LSA_LINK_TYPE_STUB)
             ospf_intra_add_stub (rt, l, v, area, parent_is_root);